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Request the Special:Log page for an article with & in the title.  The links at
the bottom (previous 50, next 50, 20, 50, 100, etc) are broken.  For example, at
  http://test.leuksman.com/index.php?title=Special%3ALog&page=a%26b
the "20" link is

http://test.leuksman.com/index.php?title=Special:Log&type=&user=&page=A&b&limit=20&offset=0

The title, a&b, should be converted to a%26b in the URL, but has instead become
A&b.

Used htmlspecialchars() where urlencode() should have been used. Fixed now in REL1_4 and 
HEAD.